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NBC Bay Area's SkyRanger on Saturday captured people burning flags and others punching each other and using helmets and skateboards as weapons. Demonstrators were also seen tipping over a garbage can and igniting its contents in Berkeley.

(Published Sunday, April 16, 2017)

A man who punched a woman during a "Patriots Day" rally in Berkeley Saturday has been identified as Nathan Damigo, the founder of a student-oriented white-nationalist group based in California.

"The campus received communications last night regarding a serious incident possibly involving one of our students and very troubling actions that may have taken place at a demonstration in Berkeley on Saturday, April 15th," Junn said in her statement. "The university takes these allegations seriously, and as president, I have initiated an immediate investigation on campus to verify and confirm details of this incident."

Junn stressed that the university "has zero tolerance for the use of violence and we will take all of the necessary legal and disciplinary measures to ensure that all students and everyone on campus have a safe and secure environment."

At least 11 people were injured and 20 people were arrested during the demonstrations, police said.

Those arrested ranged in age from 17 to 51 years old and most are from the the San Francisco Bay, though only four are from Berkeley, according to police. Two of those arrested are from Southern California.